"the new york times" reports tamerlan tsarnaev's application for u.s. citizenship was under review because a background check showed he was interviewed by the fbi in 2011 for possible ties to chechen terrorists. he was cleared, but his uncle said tamerlan tsarnaev had been radicalized in recent years. >> in life, but a pursued path of god. >> reporter: this memorial near the finish line and the marathon keeps growing. people are leaving flowers, balloons, and cards to remember the three killed here almost a week ago. this morning in london, tens of thousands of runners held a just a moment moment of silence. officials increased the number of police on site by 40%. susan macinnis, cbs news, boston. >> and police now say before a shootout with the suspects on friday, the brothers used the atm card of a man they had car jacked. they also had a pressure cooker like those used in the bombings that they threw out of the car with ammunition and two hand grenades. >>> meanwhile, several vigils were held for the victims of the four-day siege. ington, this is for